Ghost Story is the 13th book in The Dresden Files, Jim Butcher's continuing urban fantasy series about Chicago wizard Harry Dresden. Plot summary Immediately following the events of Changes, Harry finds himself between life and the afterlife, where he is informed that there has been an "irregularity" with his death and is given the option to return to Chicago as a spirit and find his killer. He elects to return and heads to the house of an ectomancer who could communicate with ghosts, Mortimer Lindquist, whom Harry had maneuvered into helping him in the past. Harry finds out that he has been dead for six months, and as a spirit, both his access to his magical powers and his ability to interact with the normal world are greatly compromised. Mort initially refuses to aid Harry, but after Harry helps to defend the house against an assault led by a powerful spirit-like entity, Mort reluctantly agrees. Mort and Harry go to Murphy's house, and Harry is subjected to intense questioning by many of his friends and colleagues to verify his identity. Once satisfied, Murphy explains to Harry that the destruction of the Red Court created a worldwide power vacuum, allowing a group called the Fomor to rise to power. The next night, Harry returns to Mort's to find that the house has been destroyed and Mort has been abducted. Harry tracks down Mort and finds him trapped by the spirit of the Corpsetaker, a previously slain foe of Harry's who is torturing Mort in an attempt to "take" his "corpse" (i.e. replace Mort's soul with the Corpsetaker's own). Harry summons the army of spirits that sheltered at Mort's, storms the hideout through the Nevernever, and takes down the wards, allowing his allies to physically assault the hideout. Harry returns to confront the Corpsetaker only to discover that she has consumed all of the spirits involved in the assault, increasing her power and giving her the ability to physically manifest - and the ability to steal a body, which she promptly does in the form of Butters. Molly attacks the Corpsetaker, who responds by entering her mind in an attempt to steal her body instead. Harry is quick to follow. Molly and the Corpsetaker wage a pitched battle for Molly's mind as Harry seeks out Molly's mental command center. He finds it, and in the process unlocks a memory of his own.